package thread;

public class Demo19 {

    public static int sum1 = 0;
    public static int sum2 = 0;

    public static void main(String[] args) throws InterruptedException {

        long beg = System.currentTimeMillis();

        int arr[] = new int[10000];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = i + 1;
        }

        Thread t1 = new Thread(() -> {
            for (int i = 0; i < arr.length; i+=2) {
                sum1 += arr[i];
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 1; i < arr.length; i+=2) {
                sum2 += arr[i];
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("sum1 = " + sum1);
        System.out.println("sum2 = " + sum2);
        System.out.println("sum = " + (sum1 + sum2));

        long end = System.currentTimeMillis();
        System.out.println("程序运行时间：" + (end - beg) + "ms");
//        StringBuilder stringBuilder = new StringBuilder("asd");
//        stringBuilder.setCharAt(2,'a');
//        System.out.println(stringBuilder);
    }
}
